Abstract: In order to reveal the different mining area coal forming conditions in Korjay Sunken,TurpanHami Basin,discusses the the relationship between coal quality and coal forming environment.Based on the data analysis of industrial analysis,harmful components and ash component index of main coal seam samples.On the basis of the analysis of the basic geological conditions such as the distribution of stratum and the characteristics of coalbearing rock series,the theories and methods of coal geology,coal petrology and coal chemistry are applied.The characteristics of coal seam and coal quality are summarized systematically,and the relationship between coal quality and coal forming environment is discussed.The results show that the study area is divided into 6 major mining areas from west to east.The coal seam is mainly developed in the Xishanyao Formation (J2x) of middle Jurassic and Badaowan Formation (J1b) of lower Jurassic.Coal quality is characterized by low ash,low sulfur,high volatile content,coal ash composition is mainly SiO2,Al2O3.Comprehensive analysis shows that the main coal seams of the MiddleLower Jurassic are formed in lakeriver delta freshwater sedimentary environment of coal formation in terrestrial facies,and also the coalforming environment are warm and humid.

Key words: korjay sunken,xishanyao formation,badaowan formation,coal quality,coalforming environment